The research of the noise characteristics including taking-off and landing in the BWB aircrafts

摘要

In this paper, it puts forward and proving an engineering model for the noise forecasting of the BWB aircrafts in the taking-off and landing stage, which is based on the newest semi-empirical model of aerodynamic noise. Such a method could present accurate values of the noise prediction quickly, including taking-off and landing, and be able to estimate or analysis the radiated noise characteristics of the different noise sources. As an example, the detailed noise forecasting results of a new aircraft called "BWB-350" including taking-off and landing are given for introducing the differences between the blended wing body aircrafts and conventional aircrafts. The computational results show that the radiated noise characteristics of the BWB-350 are quite different from the conventional aircrafts. Engine noise always becomes the major noise source and the secondary noise source is body's noise in the BWB-350, whether it's taking-off or landing. And the noise level can be effectively reduced by using the structures called "BWB". Finally, the optimized plan is found through calculating radiated noise levels of various aerodynamic designing plans by using the Semi-empirical method.